Duke and Duchess of Cambridge (bottom) on a video call with staff and teachers from Casterton Primary Academy in Burnley. (Kensington Palace)

The video call follows Prince Charles opening the first NHS field hospital in London via videolink, as the royals adapt to working from home during the COVID-19 pandemic.

Engagements were cancelled or postponed as the Royal Family followed government guidelines to avoid large gatherings to stop the spread of coronavirus.

Kate told the children and teachers: “To you and everyone who is in during this time, it must be such a relief for all the parents who are key workers to know that their children have the normality and structure and they’ve got a safe place for them to be.

“So really, really well done and for all of you, I know it’s not easy circumstances, but it’s fantastic.”

A teacher replied: “Thank you so much. I think everyone is just pleased to be able to help.”

William added: “Good northern volunteering spirit going on up there, very good of you!”